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gaze

A globbing fs.watch wrapper built from the best parts of other fine watch libs.

gaze

A globbing fs.watch wrapper built from the best parts of other fine watch libs.
Compatible with Node.js 4.x/0.12/0.10, Windows, OSX and Linux.

Install the module with: npm install gaze or place into your package.json and run npm install.

var gaze = require('gaze');
 
// Watch all .js files/dirs in process.cwd() 
gaze('**/*.js', function(err, watcher) {
  // Files have all started watching 
  // watcher === this 
 
  // Get all watched files 
  var watched = this.watched();
 
  // On file changed 
  this.on('changed', function(filepath) {
    console.log(filepath + ' was changed');
  });
 
  // On file added 
  this.on('added', function(filepath) {
    console.log(filepath + ' was added');
  });
 
  // On file deleted 
  this.on('deleted', function(filepath) {
    console.log(filepath + ' was deleted');
  });
 
  // On changed/added/deleted 
  this.on('all', function(event, filepath) {
    console.log(filepath + ' was ' + event);
  });
 
  // Get watched files with relative paths 
  var files = this.relative();
});
 
// Also accepts an array of patterns 
gaze(['stylesheets/*.css', 'images/**/*.png'], function() {
  // Add more patterns later to be watched 
  this.add(['js/*.js']);
});
var Gaze = require('gaze').Gaze;
 
var gaze = new Gaze('**/*');
 
// Files have all started watching 
gaze.on('ready', function(watcher) { });
 
// A file has been added/changed/deleted has occurred 
gaze.on('all', function(event, filepath) { });
gaze('**/*', function(error, watcher) {
  if (error) {
    // Handle error if it occurred while starting up 
  }
});
 
// Or with the alternative interface 
var gaze = new Gaze();
gaze.on('error', function(error) {
  // Handle error here 
});
gaze.add('**/*');

See isaacs's minimatch for more information on glob patterns.

  • patterns {String|Array} File patterns to be matched
  • options {Object}
  • callback {Function}
    • err {Error | null}
    • watcher {Object} Instance of the Gaze watcher

Create a Gaze object by instancing the gaze.Gaze class.

var Gaze = require('gaze').Gaze;
var gaze = new Gaze(pattern, options, callback);
  • options The options object passed in.
    • interval {integer} Interval to pass to fs.watchFile
    • debounceDelay {integer} Delay for events called in succession for the same file/event in milliseconds
    • mode {string} Force the watch mode. Either 'auto' (default), 'watch' (force native events), or 'poll' (force stat polling).
    • cwd {string} The current working directory to base file patterns from. Default is process.cwd().
  • ready(watcher) When files have been globbed and watching has begun.
  • all(event, filepath) When an added, changed or deleted event occurs.
  • added(filepath) When a file has been added to a watch directory.
  • changed(filepath) When a file has been changed.
  • deleted(filepath) When a file has been deleted.
  • renamed(newPath, oldPath) When a file has been renamed.
  • end() When the watcher is closed and watches have been removed.
  • error(err) When an error occurs.
  • nomatch When no files have been matched.
  • emit(event, [...]) Wrapper for the EventEmitter.emit. added|changed|deleted events will also trigger the all event.
  • close() Unwatch all files and reset the watch instance.
  • add(patterns, callback) Adds file(s) patterns to be watched.
  • remove(filepath) removes a file or directory from being watched. Does not recurse directories.
  • watched() Returns the currently watched files.
  • relative([dir, unixify]) Returns the currently watched files with relative paths.
    • dir {string} Only return relative files for this directory.
    • unixify {boolean} Return paths with / instead of \\ if on Windows.

Other great watch libraries to try are:

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using grunt.

  • 1.1.1 - Prevent fs.watch errors from escaping error handler (@rosen-vladimirov). Fix _addToWatched without path.sep (@wyicwx).
  • 1.1.0 - Update to globule@1.0.0 with minimatch >= 3.0.0.
  • 1.0.0 - Revert back to 0.5.2. Drop support for Node.js v0.8. Fix for maxListeners. Update globule to 0.2.0.
  • 0.6.4 - Catch and emit error from readdir (@oconnore). Fix for 0 maxListeners. Use graceful-fs to avoid EMFILE errors in other places fs is used. Better method to determine if pathwatcher was built. Fix keeping process alive too much, only init pathwatcher if a file is being watched. Set min required to Windows Vista when building on Windows (@pvolok).
  • 0.6.3 - Add support for node v0.11
  • 0.6.2 - Fix argument error with watched(). Fix for erroneous added events on folders. Ignore msvs build error 4244.
  • 0.6.1 - Fix for absolute paths.
  • 0.6.0 - Uses native OS events (fork of pathwatcher) but can fall back to stat polling. Everything is async to avoid blocking, including relative() and watched(). Better error handling. Update to globule@0.2.0. No longer watches cwd by default. Added mode option. Better EMFILE message. Avoids ENOENT errors with symlinks. All constructor arguments are optional.
  • 0.5.2 - Fix for ENOENT error with non-existent symlinks [BACKPORTED].
  • 0.5.1 - Use setImmediate (process.nextTick for node v0.8) to defer ready/nomatch events (@amasad).
  • 0.5.0 - Process is now kept alive while watching files. Emits a nomatch event when no files are matching.
  • 0.4.3 - Track file additions in newly created folders (@brett-shwom).
  • 0.4.2 - Fix .remove() method to remove a single file in a directory (@kaelzhang). Fixing Cannot call method 'call' of undefined (@krasimir). Track new file additions within folders (@brett-shwom).
  • 0.4.1 - Fix watchDir not respecting close in race condition (@chrisirhc).
  • 0.4.0 - Drop support for node v0.6. Use globule for file matching. Avoid node v0.10 path.resolve/join errors. Register new files when added to non-existent folder. Multiple instances can now poll the same files (@jpommerening).
  • 0.3.4 - Code clean up. Fix path must be strings errors (@groner). Fix incorrect added events (@groner).
  • 0.3.3 - Fix for multiple patterns with negate.
  • 0.3.2 - Emit end before removeAllListeners.
  • 0.3.1 - Fix added events within subfolder patterns.
  • 0.3.0 - Handle safewrite events, forceWatchMethod option removed, bug fixes and watch optimizations (@rgaskill).
  • 0.2.2 - Fix issue where subsequent add calls dont get watched (@samcday). removeAllListeners on close.
  • 0.2.1 - Fix issue with invalid added events in current working dir.
  • 0.2.0 - Support and mark folders with path.sep. Add forceWatchMethod option. Support renamed events.
  • 0.1.6 - Recognize the cwd option properly
  • 0.1.5 - Catch too many open file errors
  • 0.1.4 - Really fix the race condition with 2 watches
  • 0.1.3 - Fix race condition with 2 watches
  • 0.1.2 - Read triggering changed event fix
  • 0.1.1 - Minor fixes
  • 0.1.0 - Initial release

Copyright (c) 2015 Kyle Robinson Young
Licensed under the MIT license.